Non-stick plate assembly, preparation method thereof, cooking utensil and cooking equipment

Abstract

The invention discloses a non-stick plate assembly and a preparation method thereof, a cooking utensil and cooking equipment. The non-stick plate assembly comprises: a substrate layer; the concave-convex layer is arranged on one side of the base plate layer, at least one protrusion and at least one groove are formed in the side, away from the base plate layer, of the concave-convex layer, the protrusions and the grooves are alternately arranged, and the concave-convex layer contains Fe elements; the CrN layer is arranged on the side, away from the substrate layer, of the concave-convex layer, and the CrN layer comprises a CrN phase. By arranging the concave-convex layer with the concave-convex structure, the non-stick performance of the plate can be improved under the condition of less oil. Meanwhile, the CrN layer containing the CrN phase is arranged on the side, away from the base plate layer, of the concave-convex layer, so that the inner surface of the non-stick plate assembly can still present the silver white effect after being subjected to high temperature, and the problem that the inner surface of the non-stick plate assembly is prone to yellowing after being subjected to high temperature is solved. In addition, the safety performance and the anti-rust performance of the non-stick plate assembly are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of household electrical appliances, and in particular relates to a non-stick plate assembly and a preparation method thereof, a cooking utensil and a cooking device. Background Art

[0002] With the increasing demand for easy-to-clean cooking utensils, frying pans are increasingly using non-stick coatings, such as PTFE, PFA, and ceramic coatings, or applying special surface treatments to the pan body to create a non-stick coating. However, these non-stick coatings have low hardness, poor wear resistance, and are not resistant to metal spatulas and steel wool. Therefore, they are easily damaged over time, significantly reducing their non-stick properties.

[0003] Stainless steel is a common material for cooking utensils such as cookware and rice cooker liners. However, stainless steel contains a large amount of iron. At high temperatures, the iron on the surface of stainless steel easily oxidizes to form oxides, causing the surface of the stainless steel to yellow. For example, at temperatures above 160°C, the surface of 304 stainless steel will slightly yellow, and above 220°C, the surface will become severely yellow, seriously affecting the appearance of the cooking utensils. Summary of the Invention

[0004] The present invention aims to solve, at least to a certain extent, one of the technical problems in the related art. To this end, the purpose of the present invention is to provide a non-stick sheet assembly and a method for preparing the same, a cooking utensil, and a cooking device. The non-stick sheet assembly proposed in the present invention can improve the non-stick performance of the sheet in a low-oil scenario by providing a concave-convex layer having a concave-convex structure. At the same time, by providing a CrN layer containing a CrN phase on the side of the concave-convex layer away from the substrate layer, the inner surface of the non-stick sheet assembly can also present a silvery-white effect after being subjected to high temperatures, thereby solving the problem that the inner surface of the non-stick sheet assembly is prone to yellowing after being subjected to high temperatures. In addition, the safety performance and rust resistance of the non-stick sheet assembly are also improved.

[0005] In one aspect of the present invention, a non-stick sheet material assembly is provided. According to an embodiment of the present invention, the non-stick sheet material assembly comprises:

[0006] substrate layer;

[0007] a concavo-convex layer, the concavo-convex layer being arranged on one side of the substrate layer, the concavo-convex layer being provided with at least one protrusion and at least one groove on a side away from the substrate layer, the protrusions and the grooves being arranged alternately, and the concavo-convex layer containing Fe element;

[0008] A CrN layer is provided on a side of the concave-convex layer away from the substrate layer, and the CrN layer contains a CrN phase.

[0009] According to the non-stick sheet assembly of the embodiment of the present invention, by providing a concave-convex layer having a concave-convex structure (i.e., alternating protrusions and grooves) on one side of the substrate layer, the non-stick performance of the sheet can be improved in low-oil scenarios, achieving a non-stick cooking effect for food. At the same time, by providing a CrN layer containing a CrN phase on the side of the concave-convex layer away from the substrate layer, the present invention enables the inner surface of the non-stick sheet assembly to also present a silvery-white effect after being subjected to high temperatures, thereby solving the problem of the inner surface of the non-stick sheet assembly easily turning yellow after being subjected to high temperatures; at the same time, it also solves the problem of the iron element contained in the surface of the concave-convex layer being oxidized into iron oxide and entering the food, which is harmful to human health, thereby improving the safety performance of the non-stick sheet assembly. In addition, the rust resistance of the non-stick sheet assembly is also improved.

[0010] In addition, the non-stick sheet material assembly according to the above embodiment of the present invention may also have the following additional technical features:

[0011] In some embodiments of the present invention, the CrN layer is disposed on at least a portion of the surface of the concave-convex layer away from the substrate layer, and a molar ratio of Cr element to N element in the CrN layer is (0.5-2):1.

[0012] In some embodiments of the present invention, the CrN layer is formed on a side of the concave-convex layer away from the substrate layer by a nitriding method, and a molar ratio of Cr element to N element in the CrN layer is (0.3-0.8):1.

[0013] In some embodiments of the present invention, the CrN layer is disposed on a surface of the concave-convex layer away from the substrate layer, and the thickness of the CrN layer is 0.5 μm to 3 μm.

[0014] In some embodiments of the present invention, the CrN layer is formed on a side of the concave-convex layer away from the substrate layer by a nitriding method, and the thickness of the CrN layer is 0.5 μm to 80 μm.

[0015] In some embodiments of the present invention, the concave-convex layer includes stainless steel, which includes: C≤0.08wt%, Si≤1wt%, Mn≤2wt%, P≤0.05wt%, S≤0.03wt%, 15wt%~21wt% of Cr, 7wt%~15wt% of Ni and Mo≤3wt%, and the remainder is Fe and unavoidable impurities.

[0016] In some embodiments of the present invention, the present invention further comprises: a transparent non-stick layer, wherein the transparent non-stick layer is disposed on at least a portion of the surface of the CrN layer away from the substrate layer, and the transparent non-stick layer contains at least one of Si and F.

[0017] In some embodiments of the present invention, the transparent non-stick layer comprises, in atomic percentage, 1% to 10% Si, 20% to 40% C, 20% to 50% O, and the remainder is H; or, in atomic percentage, the transparent non-stick layer comprises, in atomic percentage, 20% to 40% F, 25% to 35% C, 25% to 35% O, and the remainder is H.

[0018] In some embodiments of the present invention, the thickness of the transparent non-stick layer is 1 nm to 100 nm.

[0019] In some embodiments of the present invention, in a cross section perpendicular to the non-stick sheet assembly, the projection width of the top of the protrusion on the plane where the substrate layer is located is d, and the projection width of the top of the groove on the plane where the substrate layer is located is k, satisfying d / (d+k) is 20% to 60%.

[0020] In some embodiments of the present invention, a projection width d of the top of the protrusion on the plane where the substrate layer is located is 0.1 mm to 1.5 mm.

[0021] In some embodiments of the present invention, the depth h of the groove is 40 μm to 150 μm.

[0022] In some embodiments of the present invention, in a cross section perpendicular to the non-stick sheet assembly, the top of the protrusion is parallel to the plane where the substrate layer is located.

[0023] In some embodiments of the present invention, in a cross section perpendicular to the non-stick plate component, the groove is in an arc shape or an inverted trapezoidal shape.

[0024] In some embodiments of the present invention, the central angle α of the arc-shaped groove is not greater than 180°.

[0025] In some embodiments of the present invention, the bottom angle β of the inverted trapezoidal groove is not less than 130°.

[0026] In a second aspect of the present invention, a method for preparing the non-stick sheet material assembly of the above embodiment is provided. According to an embodiment of the present invention, the method comprises:

[0027] Pre-treating the substrate to remove pollutants on the surface of the substrate;

[0028] forming an etching mask surface with a preset pattern on one side of the pretreated substrate, and placing the side of the substrate with the etching mask surface in an etching solution for chemical etching to form a concave-convex layer including at least one protrusion and at least one groove alternately arranged;

[0029] A CrN layer is formed on the surface of the concave-convex layer away from the substrate layer by using a PVD method, or a CrN layer is formed on the side of the concave-convex layer away from the substrate layer by using a nitriding method.

[0030] According to the method for preparing a non-stick sheet assembly according to an embodiment of the present invention, by forming a concave-convex layer having a concave-convex structure (i.e., alternating protrusions and grooves) on one side of the substrate layer, the non-stick performance of the sheet can be improved in a low-oil scenario, achieving a non-stick cooking effect for food. At the same time, the present invention forms a CrN layer containing a CrN phase on the side of the concave-convex layer away from the substrate layer, so that the inner surface of the non-stick sheet assembly can also present a silvery-white effect after being subjected to high temperature, thereby solving the problem that the inner surface of the non-stick sheet assembly is easily yellowed after being subjected to high temperature; at the same time, it also solves the problem that the iron element contained in the surface of the concave-convex layer is oxidized into iron oxide and enters the food, which is harmful to human health, thereby improving the safety performance of the non-stick sheet assembly. In addition, the rust resistance of the non-stick sheet assembly is also improved.

[0031] In its third aspect, the present invention provides a cooking utensil. According to an embodiment of the present invention, the cooking utensil includes the non-stick sheet assembly of the above embodiments, or a non-stick sheet assembly produced using the method of the above embodiments. By providing a concave-convex structure, the non-stick performance of the cooking utensil can be improved even in low-oil cooking environments. When cooking with this cooking utensil, food does not stick to the pan, improving the taste and aesthetics of the food while also meeting the need for low-oil cooking. Furthermore, the safety and rust resistance of the cooking utensil are enhanced.

[0032] In addition, the cooking appliance according to the above embodiment of the present invention may also have the following additional technical features:

[0033] In some embodiments of the present invention, the container comprises a bottom wall and a side wall, wherein the bottom wall and the side wall are connected to form a receiving space; the bottom wall comprises the non-stick sheet assembly described in the above embodiment or the non-stick sheet assembly manufactured by the method of the above embodiment; and / or, the side wall comprises the non-stick sheet assembly described in the above embodiment or the non-stick sheet assembly manufactured by the method of the above embodiment.

[0034] In its fourth aspect, the present invention provides a cooking device. According to an embodiment of the present invention, the cooking device comprises the cooking utensils of the above embodiments. This cooking device possesses all the features and advantages of the aforementioned cooking devices, and will not be further elaborated here. In general, this cooking device can improve the non-stick performance of the cooking device in low-oil cooking environments. It also enhances the safety and rust resistance of the cooking device.

[0035] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0037] Figure 1 is a schematic cross-sectional view of a non-stick sheet assembly according to one embodiment of the present invention;

[0038] Figure 2 is a schematic cross-sectional view of a non-stick sheet material assembly according to yet another embodiment of the present invention;

[0039] Figure 3 for Figure 1 A schematic diagram of a local area (A region);

[0040] Figure 4 is a top view of a non-stick plate assembly according to an embodiment of the present invention;

[0041] Figure 5 A schematic cross-sectional view of a non-stick sheet material assembly according to another embodiment of the present invention;

[0042] Figure 6 for Figure 5 A schematic diagram of a local area (area B);

[0043] Figure 7 This is the cross-sectional microscopic morphology 1 of the non-stick plate assembly of Example 2 of the present invention;

[0044] Figure 8 This is the second cross-sectional microscopic morphology of the non-stick plate component of Example 2 of the present invention.

[0045] Reference numerals:

[0046] 100-substrate layer, 200-concave-convex layer, 201-protrusion, 202-groove, 300-CrN layer, 400-transparent non-stick layer. DETAILED DESCRIPTION

[0047] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0048] In one aspect of the present invention, a non-stick sheet material assembly is provided. Figure 1-6The non-stick sheet assembly includes: a substrate layer 100; a concave-convex layer 200, which is disposed on one side of the substrate layer 100. The concave-convex layer 200 has at least one protrusion 201 and at least one groove 202 on the side away from the substrate layer 100, with the protrusions 201 and grooves 202 arranged alternately. The concave-convex layer 200 contains the element Fe; and a CrN layer 300, which is disposed on the side away from the substrate layer 100 and contains a CrN phase. Therefore, by disposing the concave-convex layer 200 having a concave-convex structure (i.e., alternating protrusions 201 and grooves 202) on one side of the substrate layer 100, the non-stick sheet assembly can improve the sheet's non-stick properties in low-oil cooking environments, achieving a non-stick cooking effect for food. Furthermore, by disposing a CrN layer 300 containing a CrN phase on the side of the concave-convex layer 200 away from the substrate layer 100, the present invention allows the inner surface of the non-stick sheet assembly to exhibit a silvery-white color even after exposure to high temperatures, thereby resolving the issue of the inner surface of the non-stick sheet assembly being susceptible to yellowing after exposure to high temperatures. Furthermore, the present invention also addresses the issue of iron contained on the surface of the concave-convex layer being oxidized into iron oxide and entering food, which is harmful to human health. This improves the safety of the non-stick sheet assembly and enhances its rust resistance.

[0049] The following is a detailed description of the principle by which the non-stick plate assembly proposed by the present invention can achieve the above beneficial effects:

[0050] In the related art, non-stick coatings are often used to improve the cleanability of cooking utensils, but non-stick coatings are easily damaged during long-term use, resulting in a significant reduction in their non-stick performance. In order to solve the above problems, the present invention provides a new type of non-stick plate assembly, which can improve the non-stick performance of the plate in a low-oil scenario by providing a concave-convex layer 200 with a concave-convex structure (i.e., alternating protrusions 201 and grooves 202) on one side of the substrate layer 100, thereby achieving a non-stick cooking effect for food ingredients. The mechanism is as follows: Based on the cooking scenario of the cooker, water or oil is generally present, and a liquid film is formed between the concave-convex structures. During the cooking heating process, when the food slides on the concave-convex structure, the fluid in the concave-convex structure forms a convergent gap due to factors such as uneven heating, partial point contact expansion, and end face unevenness. The formed fluid dynamic pressure reduces the friction of the friction surface, thereby achieving a non-stick effect in a low-oil scenario.

[0051] Specifically, the mechanism for achieving non-stick cooking in low-oil cooking scenarios is as follows: During cooking, the plate's temperature rapidly rises, causing the oil in the grooves to expand and move from the bottom of the grooves along the surface toward the top. As the food and the top of the protrusions move relative to each other during cooking, the oil that has just reached the top of the grooves forms an oil film between the top of the protrusions and the food, creating hydrodynamic lubrication and preventing the food from sticking to the protrusions.

[0052] In the prior art, non-stick cookware is generally coated with non-stick coatings such as Teflon and ceramics, but with long-term use, the coating is easy to peel off and affect the non-stick performance, and the detached non-stick material is mixed with the cooking ingredients and eaten, which may have adverse effects on human health; when using conventional plates (without convex and concave structures) for cooking, it is generally chosen to add enough cooking oil to achieve the purpose of non-stick. The non-stick plate assembly with a concave and convex structure provided by the present invention can form a fluid dynamic lubrication and non-stick cooking effect in a low-oil cooking scene even without a non-stick coating. Experiments have shown that compared with conventional plates without a convex and concave structure, when the non-stick plate assembly with a concave and convex structure of the present invention is used for cooking, the amount of oil added is reduced by 1 / 2 to 1 / 3, or if the ingredients themselves are rich in oil, cooking can be completed without adding additional cooking oil, thereby achieving a healthy and low-oil cooking scene and meeting the user's healthy cooking needs.

[0053] Meanwhile, in the related art, stainless steel is a common material for cooking utensils such as cookware and rice cooker inner pots. However, stainless steel contains a large amount of iron. At high temperatures, the iron on the surface of stainless steel easily oxidizes to form oxides, causing the surface of the stainless steel to yellow. Taking 304 stainless steel as an example, at temperatures above 160°C, the surface of 304 stainless steel will slightly yellow, and above 220°C, the surface will become severely yellow, seriously affecting the appearance of the cooking utensils. Moreover, as cooking progresses, the iron oxide on the surface of the stainless steel will enter the food, which is also harmful to human health. To solve the above technical problems, the present invention provides a CrN layer containing a CrN phase on the side of the concave-convex layer away from the substrate layer. This CrN phase is silvery white and relatively stable at high temperatures. Even at a high temperature of 220°C, it does not yellow. As a result, the inner surface of the non-stick plate assembly can still appear silvery white after exposure to high temperatures, solving the problem of the inner surface of the non-stick plate assembly easily yellowing after exposure to high temperatures. It also solves the problem of the iron contained in the concave-convex layer being oxidized into iron oxide and entering the food, which is harmful to human health, thereby improving the safety performance of the non-stick plate assembly. In addition, by providing a CrN layer on the side of the concave-convex layer away from the substrate layer, the rust resistance of the non-stick plate assembly is also improved.

[0054] Specifically, the CrN layer can be formed on at least a portion of the surface of the concave-convex layer away from the substrate layer by physical vapor deposition (PVD). Alternatively, the CrN layer can be formed on the surface of the concave-convex layer away from the substrate layer by nitriding, in which case the CrN layer serves as part of the concave-convex layer.

[0055] In addition, the alternating arrangement of protrusions and grooves can form a continuous physical non-stick layer, which can further improve the non-stick performance of the non-stick plate assembly, further ensure the consistency of the heat conduction efficiency of the non-stick plate assembly, and further ensure the uniform heat conduction of the non-stick plate assembly, thereby improving the uniform heating of cooking ingredients in the non-stick plate assembly.

[0056] It should be noted that the protrusions and the grooves are opposite to each other, and a groove is formed between two adjacent protrusions or a protrusion is formed between two adjacent grooves. In addition, the shapes of the protrusions and the grooves are not particularly limited. For example, the shape of the groove can be as shown in the attached figure. Figure 1 , Attachment Figure 3 and attached Figure 5 If the arc shape is shown, then a gap is formed between the two adjacent grooves as shown in the attached figure. Figure 1 , Attachment Figure 3 and attached Figure 5 For another example, the shape of the groove can be as shown in the attached Figure 2 If the inverted trapezoid is shown, a gap is formed between the two adjacent grooves. Figure 2 For another example, the shape of the protrusion can be rectangular, so a rectangular groove is formed between two adjacent protrusions.

[0057] It should also be noted that when the CrN layer is formed using PVD on at least a portion of the surface of the concave-convex layer away from the substrate layer, the thickness of the CrN layer is significantly less than the depth h of the grooves 202. Therefore, the provision of the CrN layer does not affect the effect of the concave-convex structure in improving the non-stick properties of the sheet assembly. Furthermore, it should be noted that the CrN layer is provided on the side of the non-stick sheet assembly facing the food to be cooked.

[0058] According to some specific embodiments of the present invention, Figure 1-3 And attached Figure 5-6In a cross section perpendicular to the non-stick sheet assembly, the projection width of the top of the protrusion 201 onto the plane of the substrate layer 100 is d, and the projection width of the top of the groove 202 onto the plane of the substrate layer 100 is k, satisfying d / (d+k) is 20% to 60%, for example, 20%, 30%, 40%, 50%, 60%, etc. Wherein, d / (d+k) represents the ratio of the protrusion to the entire substrate. A larger d / (d+k) indicates a larger ratio of the protrusion to the entire substrate. The inventors discovered that when the ratio d / (d+k) is within the range of 20% to 60%, during the cooking process, the liquid in groove 202 expands due to heat and is squeezed by the surrounding surface to generate dynamic pressure. Furthermore, the sufficient liquid surface area in groove 202 allows the dynamic pressure to effectively lubricate the food, significantly reducing the coefficient of friction at the plate interface and significantly improving the plate's non-stick performance. Furthermore, compared to plates without concave-convex structures, the non-stick plate assembly of the present invention requires 1 / 2 to 1 / 3 less oil during cooking, while achieving a superior non-stick cooking effect. When d / (d+k) is less than 20%, the liquid is unable to generate sufficient dynamic pressure in groove 202 due to the lack of protrusions when heated. Consequently, the cooking effect is poor with the same amount of oil, and the coefficient of friction at the plate interface is higher, resulting in poor non-stick performance. When d / (d+k) is greater than 60%, although the liquid in the groove 202 can generate dynamic pressure when heated, due to the insufficient liquid area in the groove 202, the overall dynamic pressure cannot fully lubricate the food. The cooking effect is not significantly improved with the same amount of oil, and the friction coefficient of the plate interface is large, and the non-stick performance of the plate is poor.

[0059] It should be noted that the lower the friction coefficient of the board surface, the easier it is for food to slide on the board surface and the better the non-stick performance.

[0060] As some preferred solutions, the d / (d+k) ratio is in the range of 30% to 50%. By limiting the d / (d+k) ratio within the above range, the friction coefficient of the plate interface can be further significantly reduced in a low-oil scenario, and the non-stick performance of the plate can be further significantly improved.

[0061] It should be noted that the cross section perpendicular to the non-stick sheet assembly refers to the cross section perpendicular to the large surface of the non-stick sheet assembly. The top of the protrusion 201 refers to the side of the protrusion 201 away from the substrate layer 100, and the top of the groove 202 refers to the side of the groove 202 away from the substrate layer 100. In addition, when the PVD method is used to form the CrN layer on at least a portion of the surface of the concave-convex layer away from the substrate layer, the top of the protrusion refers to the top of the protrusion containing the CrN layer, and the top of the groove refers to the top of the groove containing the CrN layer. It can be understood that when the PVD method is used to form the CrN layer on at least a portion of the surface of the concave-convex layer away from the substrate layer, since the thickness of the CrN layer is much smaller than the size of the concave-convex structure, the CrN layer provided on the surface of the concave-convex structure basically does not affect the projection width d of the top of the protrusion on the plane where the substrate layer is located and the projection width k of the top of the groove on the plane where the substrate layer is located.

[0062] It is understood that when the top of the protrusion 201 is parallel to the plane of the substrate layer 100, the width d of the projection of the top of the protrusion 201 on the plane of the substrate layer 100 is equal to the width of the top of the protrusion 201. When the line connecting the tops of the grooves 202 is parallel to the plane of the substrate layer 100, the width k of the projection of the top of the grooves 202 on the plane of the substrate layer 100 is equal to the width of the line connecting the tops of the grooves 202.

[0063] According to some specific embodiments of the present invention, the projection width d of the top of the protrusion 201 on the plane where the substrate layer 100 is located can be 0.1mm-1.5mm, for example, it can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm and 1.5mm. By limiting the projection width d of the top of the protrusion 201 on the plane where the substrate layer 100 is located to the above range, the friction coefficient of the plate interface can be further significantly reduced in the scenario of less oil, and the non-stick performance of the plate can be further significantly improved. As some preferred solutions, the projection width d of the top of the protrusion 201 on the plane where the substrate layer 100 is located can be 0.2mm-0.7mm.

[0064] According to some further specific embodiments of the present invention, Figure 1-3 And attached Figure 5-6The depth h of the groove 202 can be 40 μm to 150 μm, for example, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, etc. By limiting the depth h of the groove 202 to the above range, it is possible to avoid insufficient oil storage in the groove 202, thereby preventing the plate from being unable to provide sufficient oil lubrication for non-stick cooking, while also preventing protruding parts from being easily worn flat. Furthermore, it can prevent food residue from carbonizing in the groove 202 during high-temperature cooking, making it difficult to clean. As some preferred embodiments, the depth h of the groove 202 can be 40 μm to 80 μm.

[0065] As mentioned above, when the PVD method is used to form the above-mentioned CrN layer on at least a portion of the surface of the concave-convex layer away from the substrate layer, since the thickness of the CrN layer is much smaller than the size of the concave-convex structure, the CrN layer provided on the surface of the concave-convex structure does not substantially affect the depth h of the groove 202. The depth h of the above-mentioned groove 202 refers to the depth h of the groove 202 including the CrN layer. Figure 1-3 shown.

[0066] According to some further specific embodiments of the present invention, in a cross section perpendicular to the non-stick sheet assembly, the top of the protrusion 201 is parallel to the plane of the substrate layer 100. Thus, while improving the non-stick performance of the sheet, it also improves the convenience of the non-stick sheet assembly when used in cooking utensils, and at the same time prevents the protruding parts from being easily worn flat.

[0067] According to some further specific embodiments of the present invention, in a cross section perpendicular to the non-stick plate assembly, the groove 202 may be in an arc shape (e.g., Figure 1 and 5 as shown) or inverted trapezoidal (as shown in the attached Figure 2 As shown, this improves the non-stick properties of the sheet while preventing food residue from carbonizing in grooves 202 during high-temperature cooking, making cleaning difficult. During cooking, the sheet's temperature rapidly rises, causing the oil in the grooves to expand and move from the bottom of the grooves along the curved or trapezoidal surface toward the top. During cooking, the food and the top of the protrusions experience relative motion, causing the oil that has just reached the top of the grooves to form an oil film between the top of the protrusions and the food. This creates hydrodynamic lubrication, preventing the food from sticking to the top of the protrusions.

[0068] According to some specific embodiments of the present invention, Figure 1 and 5 The central angle α of the arc-shaped groove may be no greater than 180°, whereby the resistance of the oil in the groove to the top of the groove is small, which is conducive to the formation of an oil film.

[0069] According to some specific embodiments of the present invention, Figure 2 The bottom angle β of the inverted trapezoidal groove is not less than 130°. Therefore, the resistance of the oil in the groove to the top of the groove is small, which is conducive to the formation of an oil film.

[0070] As some specific examples, the structures of the plurality of protrusions 201 are all the same, and the structures of the plurality of grooves 202 are all the same.

[0071] It can be understood that, since the thickness of the CrN layer is much smaller than the size of the concave-convex structure, the CrN layer disposed on the surface of the concave-convex structure substantially does not affect the shapes of the protrusions 201 and the grooves 202 .

[0072] According to some specific embodiments of the present invention, when the CrN layer is formed on at least a portion of the surface of the concavo-convex layer away from the substrate layer using a PVD method (i.e., the CrN layer covers the surface of the concavo-convex structure), the molar ratio of Cr to N in the CrN layer can be (0.5-2):1, for example, 0.5:1, 0.6:1, 0.8:1, 1:1, 1.2:1, 1.4:1, 1.6:1, 1.8:1, 2:1, etc. By limiting the molar ratio of Cr to N in the CrN layer to the above range, the CrN layer further contains a large amount of silvery-white CrN phase, thereby further ensuring that the inner surface of the non-stick sheet assembly is silvery-white, avoiding the problem of yellowing of the inner surface of the cooking utensil at high temperatures, and further improving the rust resistance of the inner surface of the non-stick sheet assembly. Preferably, the molar ratio of Cr to N in the CrN layer is (0.9-1.7):1.

[0073] According to some further specific embodiments of the present invention, when the PVD method is used to form the above-mentioned CrN layer on at least a portion of the surface of the concave-convex layer away from the substrate layer, the thickness of the CrN layer can be 0.5μm to 3μm, for example, it can be 0.5μm, 1μm, 1.5μm, 2μm, 2.5μm, 3μm, etc. By limiting the thickness of the CrN layer to the above-mentioned range, it can be effectively ensured that the surface of the concave-convex structure is completely blocked by the silvery-white CrN layer, further ensuring that the inner surface of the non-stick sheet assembly appears silvery-white, and at the same time further improving the rust resistance of the inner surface of the non-stick sheet assembly.

[0074] According to some further specific embodiments of the present invention, when the nitriding method is used to form the above-mentioned CrN layer on the side of the concave-convex layer away from the substrate layer (that is, the CrN layer is part of the concave-convex layer), the molar ratio of the Cr element and the N element in the CrN layer can be (0.3 to 0.8): 1. N is reacted with Cr in stainless steel by high temperature. The following first takes stainless steel as an example to illustrate the principle of forming the above-mentioned CrN layer on the side of the concave-convex layer away from the substrate layer by the nitriding method: as N atoms penetrate into the interior of the concave-convex layer of the stainless steel material, the N atoms first dissolve in the lattice, causing lattice distortion. After the N atoms are saturated in the lattice, the remaining N atoms preferentially react with Cr to form a CrN phase. After consuming Cr, the excess N atoms will also react with Fe to form black-gray iron nitride. When the content of iron nitride in the stainless steel is too high, the surface of the stainless steel will be black-gray. Therefore, by adjusting the molar ratio of Cr to N in the CrN layer to within the range of 0.3 to 0.8:1, the present invention ensures that sufficient CrN phase is formed in the stainless steel while preventing excessive N atoms from forming excessive iron nitride, which would otherwise cause the CrN layer to appear dark gray. Preferably, the molar ratio of Cr to N in the CrN layer is 0.5 to 0.7:1.

[0075] According to some further specific embodiments of the present invention, when the CrN layer is formed on the side of the concave-convex layer away from the substrate layer by a nitriding method, the thickness of the CrN layer can be 0.5 μm to 80 μm, for example, 0.5 μm, 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, etc. By limiting the thickness of the CrN layer to the above range, it is possible to effectively ensure that the surface of the concave-convex structure appears silvery white, while avoiding excessive consumption of the Cr element due to excessive nitriding, thereby reducing the corrosion resistance of the stainless steel.

[0076] In embodiments of the present invention, the concave-convex layer contains Fe. As some specific examples, the concave-convex layer comprises stainless steel, which comprises: C ≤ 0.08 wt%, Si ≤ 1 wt%, Mn ≤ 2 wt%, P ≤ 0.05 wt%, S ≤ 0.03 wt%, 15 wt% to 21 wt% of Cr, 7 wt% to 15 wt% of Ni, and Mo ≤ 3 wt%, with the remainder being Fe and unavoidable impurities. A CrN layer comprising a CrN phase can be formed on at least a portion of the surface of the concave-convex layer of the stainless steel material by using a PVD method. A CrN layer comprising a CrN phase can also be formed on the surface of the concave-convex layer of the stainless steel material by using a nitriding method. Both methods can solve the problem of stainless steel cooking utensils being easily oxidized and yellowed at high temperatures.

[0077] In the embodiment of the present invention, the material of the substrate layer is not particularly limited and can be the same as the material of the concave-convex layer, that is, both are made of stainless steel; or the material of the substrate layer can be different from that of the concave-convex layer.

[0078] In the embodiments of the present invention, the thickness of the above-mentioned concave-convex layer and the thickness of the substrate layer are not particularly limited. As some specific embodiments, the total thickness of the non-stick plate assembly can be 1.5mm-2.5mm, for example, it can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc. Therefore, the non-stick plate assembly has a suitable thickness, which is conducive to improving cooking efficiency.

[0079] According to some specific embodiments of the present invention, Figure 5 and 6 The non-stick plate assembly may further include a transparent non-stick layer 400. The transparent non-stick layer 400 is disposed on at least a portion of the surface of the CrN layer 300 away from the substrate layer 100. The transparent non-stick layer 400 contains at least one of Si and F. By disposing the transparent non-stick layer 400 containing Si and / or F on at least a portion of the surface of the CrN layer 300 away from the substrate layer 100, the non-stick performance of the inner surface of the non-stick plate assembly is further improved.

[0080] It should be noted that the transparent non-stick layer on the surface of the CrN layer does not affect the silvery-white effect of the inner surface of the non-stick plate assembly, because the transparent non-stick layer is transparent and has a very small thickness of only 1nm to 100nm. Furthermore, it is understandable that because the thickness of the transparent non-stick layer is much smaller than the size of the concave-convex structure, the transparent non-stick layer on the surface of the CrN layer has no effect on the shape of the protrusions and grooves.

[0081] In some specific embodiments, the transparent non-stick layer may include: 1% to 10% Si, 20% to 40% C, 20% to 50% O, and the balance is H. In still other specific embodiments, the transparent non-stick layer may include: 20% to 40% F, 25% to 35% C, 25% to 35% O, and the balance is H. By limiting the content of each component to the above range, the non-stick performance of the inner surface of the non-stick sheet assembly is further improved.

[0082] In a second aspect of the present invention, a method for preparing the non-stick sheet material assembly of the above embodiment is provided. According to an embodiment of the present invention, the method comprises:

[0083] S100: Pre-treatment of substrate

[0084] In this step, the substrate may be pretreated with an alkaline solution to remove pollutants such as oil stains on the surface of the substrate.

[0085] In the embodiments of the present invention, the specific type of the above-mentioned alkali solution is not particularly limited, and those skilled in the art can select it according to actual needs. As some specific examples, the above-mentioned alkali solution can be a NaOH or KOH solution with a concentration of 0.25 to 1.25 mol / L.

[0086] S200: Forming a concave-convex layer on one side of the pre-treated substrate

[0087] In this step, an etching mask surface with a preset pattern is first prepared, and the pattern of the etching mask surface corresponds to the structure of the concave-convex layer to be formed. Then, the etching mask surface is set on one side of the pretreated substrate. Finally, the side of the substrate with the etching mask surface is placed in an etching solution for chemical etching, wherein the area covered by the mask plate will not be etched by the etching solution, while the area not covered by the mask plate will be etched by the etching solution, and finally a concave-convex layer including at least one protrusion and at least one groove alternately arranged is formed.

[0088] According to some specific embodiments of the present invention, the etching solution includes an acid and an iron salt. The concentration of the acid in the etching solution can be 0.7 mol / L to 1.3 mol / L (for example, 0.7 mol / L, 0.8 mol / L, 0.9 mol / L, 1.0 mol / L, 1.2 mol / L, 1.3 mol / L, etc.), and the concentration of the iron salt in the etching solution can be 1 mol / L to 1.5 mol / L (for example, 1 mol / L, 1.1 mol / L, 1.2 mol / L, 1.3 mol / L, 1.4 mol / L, 1.5 mol / L, etc.). The etching effect of the above etching solution is relatively good. Preferably, the acid is HCl and the iron salt is FeCl3.

[0089] S300: Forming CrN layer

[0090] In this step, a CrN layer is formed on the surface of the concave-convex layer away from the substrate layer by using a PVD method, or a CrN layer is formed on the side of the concave-convex layer away from the substrate layer by using a nitriding method.

[0091] Specifically, the PVD method: the Cr target arc source is turned on in a nitrogen atmosphere, and the Cr generated by the Cr target arc source reacts with the N in the nitrogen to form a CrN layer on the surface of the concave-convex layer away from the substrate layer. The CrN layer contains a silvery-white CrN phase, and the CrN phase is relatively stable at high temperatures. Even at a high temperature of 220°C, it will not turn yellow. As a result, the inner surface of the non-stick sheet component can also present a silvery-white effect after being exposed to high temperature, solving the problem that the inner surface of the non-stick sheet component is prone to yellowing after being exposed to high temperature.

[0092] According to some specific embodiments of the present invention, a CrN layer is formed on the surface of the concave-convex layer away from the substrate layer by a PVD method, and at least one of the following conditions is satisfied: the bias voltage can be 80V~120V (for example, 80V, 90V, 100V, 110V, 120V, etc.); the cathode current can be 60A~80A (for example, 60A, 65A, 70A, 75A, 80A, etc.); the temperature can be 250℃~350℃ (for example, 250℃, 270℃, 290℃, 300℃, 310℃, 330℃, 350℃, etc.); the deposition time can be 3.5h~4.5h (for example, 3.5h, 3.7h, 3.9h, 4h, 4.1h, 4.3h, 4.5h, etc.). Under these conditions, a high-quality CrN layer with an appropriate thickness, a suitable molar ratio of Cr to N, and high quality can be deposited on the surface of the concave-convex layer, further ensuring that the inner surface of the non-stick sheet assembly maintains a silvery-white appearance even at high temperatures. It should be noted that the molar ratio of Cr to N in the CrN layer can be controlled by adjusting the bias voltage, cathode current, and temperature. The thickness of the CrN layer can also be controlled by adjusting the deposition time.

[0093] Specifically, the nitriding method is as follows: the side of the concave-convex layer away from the substrate layer is placed in a mixed atmosphere of nitrogen and hydrogen, which can be placed in a furnace and first evacuated and then nitrogen and hydrogen are introduced (wherein hydrogen plays the role of reducing the oxide on the surface of the part to obtain an "active" surface, which is conducive to nitriding; on the other hand, hydrogen can play the role of diluting nitrogen. Nitrogen is a reactive gas, and N forms CrN with Cr), and then the temperature is raised to 450℃~550℃ (for example, 450℃, 470℃, 490℃). , 500℃, 510℃, 530℃, 550℃, etc.) and keep warm for 5h~7h (for example, 5h, 5.5h, 6h, 6.5h, 7h, etc.) so that N atoms can penetrate into the concave-convex layer. As the N atoms penetrate into the interior of the concave-convex layer, the N atoms first dissolve in the crystal lattice, causing lattice distortion. After the N atoms are saturated in the crystal lattice, the remaining N atoms preferentially react with Cr to form a CrN phase, thereby forming a CrN layer. At this time, the CrN layer is part of the concave-convex layer. The CrN layer contains a silvery-white CrN phase, and the CrN phase is relatively stable at high temperatures. Even at a high temperature of 220℃, it will not yellow. As a result, the inner surface of the non-stick sheet assembly can also present a silvery-white effect after being subjected to high temperature, solving the problem that the inner surface of the non-stick sheet assembly is prone to yellowing after being subjected to high temperature.

[0094] According to some specific embodiments of the present invention, the pressure of the mixed atmosphere can be 300 Pa to 500 Pa (for example, 300 Pa, 350 Pa, 400 Pa, 450 Pa, 500 Pa, etc.), wherein P(H2):P(N2) = (2.5 to 3.5):1, for example, 2.5:1, 2.7:1, 3:1, 3.3:1, 3.5:1, etc. Thus, under the above conditions, a CrN layer with a reasonable molar ratio of Cr to N can be formed on the surface of the concave-convex layer, thereby further ensuring that the inner surface of the non-stick sheet assembly can present a silvery white effect even at high temperatures.

[0095] It should be noted that in the nitriding process, the molar ratio of Cr to N in the nitrided layer (i.e., CrN layer) is generally controlled by adjusting the nitrogen content in the mixed atmosphere, and the thickness of the nitrided layer (i.e., CrN layer) is controlled by adjusting the reaction temperature. For example, under the assumption that other conditions remain the same, increasing the reaction temperature helps to increase the degree of reaction between nitrogen and Cr, thereby increasing the thickness of the nitrided layer (i.e., CrN layer).

[0096] According to some specific embodiments of the present invention, the above method may further include:

[0097] S400: forming a transparent non-stick layer on at least a portion of the surface of the CrN layer away from the substrate layer

[0098] Specifically, a transparent non-stick layer may be formed on at least a portion of the surface of the CrN layer away from the substrate layer by electrostatic spraying or evaporation.

[0099] In its third aspect, the present invention provides a cooking utensil. According to an embodiment of the present invention, the cooking utensil includes the non-stick sheet assembly of the above embodiments, or a non-stick sheet assembly produced using the method of the above embodiments. By providing a concave-convex structure, the non-stick performance of the cooking utensil can be improved even in low-oil cooking environments. When cooking with this cooking utensil, food does not stick to the pan, improving the taste and aesthetics of the food while also meeting the need for low-oil cooking. Furthermore, the safety and rust resistance of the cooking utensil are enhanced.

[0100] According to some specific embodiments of the present invention, the above-mentioned cooking utensil includes a container bottom wall and a container side wall, the container bottom wall and the container side wall being connected to form a storage space, in which oil or water and food to be cooked can be placed; the container bottom wall includes a non-stick plate assembly of the above embodiment or a non-stick plate assembly produced by the method of the above embodiment; and / or the container side wall includes a non-stick plate assembly of the above embodiment or a non-stick plate assembly produced by the method of the above embodiment, and the food in the storage space is cooked by heating the non-stick plate assembly of the cooking utensil. Because at least a portion of the bottom wall and / or at least a portion of the side wall of the above-mentioned cooking utensil adopts the non-stick plate assembly of the present invention, the non-stick performance of the cooking utensil is improved in low-oil scenarios, and the safety and rust-proof performance of the cooking utensil are also improved. It should be noted that the concave-convex layer is provided on the side of the cooking utensil facing the food to be cooked.

[0101] According to an embodiment of the present invention, the cooking utensil is selected from at least one of a wok, a frying pan, a stew pot, a milk pan, an electric rice cooker, and a pressure cooker. In the case of an electric rice cooker or a pressure cooker, the CrN layer is provided on the inner surface of the rice cooker or pressure cooker. This can meet most cooking needs. In addition to the aforementioned structure, the cooking utensil may also include features common to conventional cooking utensils. For example, a wok may also include a handle.

[0102] Those skilled in the art will appreciate that the cooking appliance may further include a heating base, which includes a functional module that generates heat for the heating element assembly. According to a specific embodiment of the present invention, the functional module may be an electromagnetic induction coil that generates a magnetic field to generate eddy currents in the heating layer and / or the heating layer, thereby generating heat and cooking the food within the storage space.

[0103] In its fourth aspect, the present invention provides a cooking device. According to an embodiment of the present invention, the cooking device comprises the cooking utensils of the above embodiments. This cooking device possesses all the features and advantages of the aforementioned cooking devices, and will not be further elaborated here. In general, this cooking device can improve the non-stick performance of the cooking device in low-oil cooking environments. It also enhances the safety and rust resistance of the cooking device.

[0104] The following embodiments of the present invention are described in detail. It should be noted that the following embodiments are illustrative and are intended only to explain the present invention and are not to be construed as limiting the present invention. In addition, unless otherwise expressly stated, all reagents used in the following embodiments are commercially available or can be synthesized according to methods described herein or known methods. Reaction conditions not listed are also readily available to those skilled in the art.

[0105] Example 1

[0106] This embodiment provides a non-stick plate assembly, the preparation method of which includes:

[0107] 1) A 2 mm thick 304 stainless steel substrate was pretreated with a 1.0 mol / L NaOH solution to remove oil and other pollutants on the surface of the substrate.

[0108] 2) Prepare an etching mask with a specific pattern, setting d = 0.2 mm, k = 0.6 mm, and d / (d + k) = 25%. Prepare an etching solution with a concentration of 1.1 mol / L HCl and a concentration of 1.23 mol / L FeCl3. Then, place the etching mask on one side of the pretreated substrate. Finally, place the substrate with the etching mask in the etching solution at 35°C for 35 minutes for chemical etching. After the reaction is complete, remove the test piece, rinse the black residue on the surface with deionized water, and dry it to obtain a non-stick plate with a concave-convex structure. Testing shows that the depth h of the grooves is 85 μm.

[0109] 3) Using the PVD method, a Cr target arc source was turned on in a nitrogen atmosphere. The Cr generated by the Cr target arc source reacted with the N in the nitrogen to deposit a CrN layer on the surface of the concave-convex structure. The bias voltage was 100 V, the cathode current was 70 A, the temperature was 300°C, and the deposition time was 4 hours.

[0110] Example 2

[0111] The only difference between this embodiment and embodiment 1 is that d=0.4 mm, k=0.7 mm, d / (d+k)=36%, and the etching time is 30 minutes. After testing, the depth h of the groove is 73 μm.

[0112] The rest of the contents are the same as those in Example 1.

[0113] Example 3

[0114] The only difference between this embodiment and embodiment 1 is that d=0.5 mm, k=0.75 mm, d / (d+k)=40%, and the etching time is 28 minutes. After testing, the depth h of the groove is 68 μm.

[0115] The rest of the contents are the same as those in Example 1.

[0116] Example 4

[0117] The only difference between this embodiment and embodiment 1 is that d=0.7 mm, k=0.7 mm, d / (d+k)=50%, and the etching time is 23 minutes. After testing, the depth h of the groove is 57 μm.

[0118] The rest of the contents are the same as those in Example 1.

[0119] Example 5

[0120] The only difference between this embodiment and embodiment 1 is that d=1.2 mm, k=1.0 mm, d / (d+k)=54.5%, and the etching time is 20 minutes. After testing, the depth h of the groove is 49 μm.

[0121] The rest of the contents are the same as those in Example 1.

[0122] Example 6

[0123] The only difference between this embodiment and embodiment 1 is that d=0.4 mm, k=3.6 mm, d / (d+k)=10%, and the etching time is 45 minutes. After testing, the depth h of the groove is 111 μm.

[0124] The rest of the contents are the same as those in Example 1.

[0125] Example 7

[0126] The only difference between this embodiment and embodiment 1 is that d=0.4 mm, k=0.2 mm, d / (d+k)=67%, and the etching time is 15 minutes. After testing, the depth h of the groove is 36 μm.

[0127] The rest of the contents are the same as those in Example 1.

[0128] Example 8

[0129] The only difference between this embodiment and embodiment 2 is that the bias voltage is 80 V, the cathode current is 60 A, the temperature is 250° C., and the deposition time is 4 hours.

[0130] The rest of the contents are the same as those in Example 2.

[0131] Example 9

[0132] The only difference between this embodiment and embodiment 2 is that the bias voltage is 120 V, the cathode current is 80 A, the temperature is 350° C., and the deposition time is 4 hours.

[0133] The rest of the contents are the same as those in Example 2.

[0134] Example 10

[0135] The only difference between this embodiment and embodiment 2 is that the bias voltage is 100 V, the cathode current is 70 A, the temperature is 300° C., and the deposition time is 3.5 hours.

[0136] The rest of the contents are the same as those in Example 2.

[0137] Example 11

[0138] The only difference between this embodiment and embodiment 2 is that the bias voltage is 100 V, the cathode current is 70 A, the temperature is 300° C., and the deposition time is 4.5 hours.

[0139] The rest of the contents are the same as those in Example 2.

[0140] Example 12

[0141] The only difference between this embodiment and embodiment 2 is that:

[0142] 3) Using the nitriding method, the sample is placed in a furnace, first evacuated and then filled with nitrogen and hydrogen. The side of the concave-convex structure away from the substrate layer is placed in a mixed atmosphere of nitrogen and hydrogen. The temperature is then raised to 500°C and maintained for 6 hours. As nitrogen atoms penetrate into the interior of the concave-convex structure, they first dissolve in the crystal lattice, causing lattice distortion. After the lattice is saturated with nitrogen atoms, the remaining nitrogen atoms preferentially react with Cr to form a CrN phase, thus forming a CrN layer. The CrN layer at this time is part of the concave-convex layer. The pressure of the mixed atmosphere is 400 Pa, with P(H2):P(N2) = 3:1.

[0143] The rest of the contents are the same as those in Example 2.

[0144] Example 13

[0145] The only difference between this embodiment and embodiment 12 is that: P(H2):P(N2)=2.5:1.

[0146] The rest of the contents are the same as in Example 12.

[0147] Example 14

[0148] The only difference between this embodiment and embodiment 12 is that: P(H2):P(N2)=3.5:1.

[0149] The rest of the contents are the same as in Example 12.

[0150] Example 15

[0151] The only difference between this embodiment and embodiment 12 is that:

[0152] The reaction temperature is 450°C.

[0153] The rest of the contents are the same as in Example 12.

[0154] Example 16

[0155] The only difference between this embodiment and embodiment 12 is that:

[0156] The reaction temperature is 550°C.

[0157] The rest of the contents are the same as in Example 12.

[0158] Example 17

[0159] The only difference between this embodiment and embodiment 2 is that:

[0160] Also includes:

[0161] 4) forming a transparent non-stick layer with a thickness of 20 nm on the surface of the CrN layer by:

[0162] The transparent coating is heated and evaporated and deposited on the surface of the CrN layer by an evaporation method, and the evaporation time is 20 minutes.

[0163] According to tests, the transparent non-stick layer comprises, in atomic percentage, 5% Si, 30% C, 35% O, and the balance H.

[0164] The rest of the contents are the same as those in Example 2.

[0165] Example 18

[0166] The only difference between this embodiment and embodiment 2 is that:

[0167] Also includes:

[0168] 4) forming a transparent non-stick layer with a thickness of 70 nm on the surface of the CrN layer by:

[0169] The transparent coating is heated and evaporated and deposited on the surface of the CrN layer by an evaporation method, and the evaporation time is 100 minutes.

[0170] According to tests, the transparent non-stick layer comprises, in atomic percentage, 30% F, 30% C, 30% O, and the balance H.

[0171] The rest of the contents are the same as those in Example 2.

[0172] Comparative Example 1

[0173] A 2 mm thick 304 stainless steel substrate was pretreated with a 1 mol / L NaOH solution to remove oil and other pollutants on the surface of the substrate.

[0174] Comparative Example 2

[0175] This comparative example provides a non-stick plate assembly, the preparation method of which includes:

[0176] 1) A 2 mm thick 304 stainless steel substrate was pretreated with a 1 mol / L NaOH solution to remove oil and other pollutants on the surface of the substrate.

[0177] 2) Prepare an etching mask with a specific pattern, setting d = 0.4 mm, k = 0.7 mm, and d / (d + k) = 36%. This etching mask was then placed on one side of the pretreated substrate. Finally, the substrate, with the etching mask, was chemically etched in an etchant at 35°C for 30 minutes. After the reaction was complete, the test piece was removed, rinsed with deionized water to remove any black residue, and dried to produce a non-stick plate assembly with a concave-convex structure. Testing revealed that the depth h of the grooves was 73 μm.

[0178] In this comparative example, a CrN layer is not formed on the surface of the concavo-convex structure, and other contents are the same as those in Example 2.

[0179] The parameters of Examples 1-18 and Comparative Examples 1-2 are shown in Table 1.

[0180] Table 1

[0181]

[0182]

[0183] The cross-sectional micromorphology of the non-stick sheet assembly prepared in Examples 1-18 was observed using a scanning electron microscope, and the thickness of the CrN layer was measured. The element content ratios of Cr and N in the CrN layer of the non-stick sheet assembly prepared in Examples 1-18 were measured using an energy dispersive spectrometer, and the results are shown in Table 2. The cross-sectional micromorphology of the non-stick sheet assembly in Example 2 is shown in the attached figure. Figure 7 and 8 shown.

[0184] Performance Testing

[0185] Friction coefficient test:

[0186] The friction coefficient of one side of the concave-convex structure of Examples 1-18 and Comparative Examples 1-2 was tested using a friction coefficient tester with a GCr15 ball of 6.35 mm diameter as the abrasive component and a test pressure of 25 N. 2 mL of cooking oil was applied to the surface. The results are shown in Table 2.

[0187] Non-stick performance test:

[0188] The temperature of the non-stick plate assemblies prepared in Examples 1-18 and Comparative Examples 1-2 was raised to 150-170° C., eggs were beaten, and the egg whites were scooped out with a silicone spatula after solidification. This was repeated three times, and the non-stick grade was determined. The results are shown in Table 2.

[0189] Non-stick grade judgment criteria:

[0190] Level 1: Scrape out without damage, leaving no residue; Level 2: Cannot be scraped out without damage, and the residue can be removed with a wet rag; Level 3: Cannot be scraped out without damage, and the residue cannot be removed with a wet rag.

[0191] High temperature oxidation test:

[0192] The non-stick plate assembly samples prepared in Examples 1-18 and Comparative Examples 1-2 were placed in a forced air drying oven at 220° C. and kept warm for 30 minutes.

[0193] Salt spray test:

[0194] In accordance with GB / T 10125 "Artificial Atmosphere Corrosion Test Salt Spray Test", the non-stick panel assembly samples prepared in Examples 1-18 and Comparative Examples 1-2 were placed in a neutral salt spray test chamber at 35°C ± 2°C and continuously sprayed with a 5% sodium chloride solution. The samples were removed every 24 hours, rinsed with water, and air-dried. The surface quality was visually inspected to ensure that the coating and the surface coating were free of rust, cracking, and shedding. The results are shown in Table 2.

[0195] Table 2

[0196]

[0197]

[0198] As can be seen from Table 2, Examples 1-5, Examples 8-18, and Comparative Example 2 all have a concavo-convex structure on the surface of the 304 stainless steel substrate, and d / (d+k) is within the range of 20%-60%. Examples 1-5, Examples 8-18, and Comparative Example 2 all have low coefficients of friction and all have a non-stick performance of Level 1. This shows that if a concavo-convex structure is provided on the surface of a 304 stainless steel substrate and d / (d+k) is within the range of 20%-60%, the non-stick performance is excellent. Comparative Example 1, on the other hand, does not have a concavo-convex structure on the surface of the 304 stainless steel substrate. The friction coefficient of Comparative Example 1 is high, and the non-stick performance is Level 3. This shows that if a concavo-convex structure is not provided on the surface of the 304 stainless steel substrate, the non-stick performance is poor. Both Examples 6 and 7 feature concave-convex structures on the surface of a 304 stainless steel substrate. However, the d / (d+k) ratio falls outside the 20%-60% range. Consequently, the coefficients of friction in Examples 6 and 7 are relatively high, with the non-stick performance of Example 6 rated at Level 3 and that of Example 7 at Level 2. This indicates that a d / (d+k) ratio that is too large or too small is detrimental to reducing the coefficient of friction and improving the non-stick performance of the sheet material.

[0199] As shown in Table 2, Examples 1-18 all incorporate a CrN layer on one side of the convex-concave structure. After high-temperature oxidation testing, the inner surfaces of the non-stick sheet assemblies of Examples 1-18 all exhibited a silvery-white appearance. Comparative Examples 1 and 2, on the other hand, lacked a CrN layer, and both exhibited a yellowish-brown appearance after high-temperature oxidation testing. This demonstrates that incorporating a CrN layer on one side of the convex-concave structure can address the issue of the inner surface of the non-stick sheet assembly being susceptible to yellowing after exposure to high temperatures.

[0200] As shown in Table 2, Examples 1-18 all incorporate a CrN layer on one side of the convex-concave structure, and the salt spray test results for the non-stick sheet assemblies for Examples 1-18 all passed the 96-hour salt spray test. Comparative Examples 1 and 2, on the other hand, lack a CrN layer, with Comparative Example 1 failing the salt spray test after 72 hours and Comparative Example 2 failing after 48 hours. This demonstrates that the rust resistance of the non-stick sheet assembly can be improved by incorporating a CrN layer on one side of the convex-concave structure.

[0201] As can be seen from Table 2, compared with Example 2, the friction coefficients of Examples 17 and 18 are relatively low, and their non-stick properties are more excellent. It can be seen that providing a transparent non-stick layer on the surface of the CrN layer further improves the non-stick performance of the inner surface of the non-stick plate assembly.

[0202] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0203] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A non-stick sheet assembly, characterized in that: include: substrate layer; a concavo-convex layer, the concavo-convex layer being arranged on one side of the substrate layer, the concavo-convex layer being provided with at least one protrusion and at least one groove on a side away from the substrate layer, the protrusions and the grooves being arranged alternately, and the concavo-convex layer containing Fe element; A CrN layer is provided on a side of the concave-convex layer away from the substrate layer, and the CrN layer contains a CrN phase.

2. The non-stick sheet material assembly according to claim 1, characterized in that: The CrN layer is disposed on at least a portion of the surface of the concavo-convex layer away from the substrate layer, and the molar ratio of Cr element to N element in the CrN layer is (0.5-2):

1.

3. The non-stick sheet material assembly according to claim 1, characterized in that: The CrN layer is formed on a side of the concave-convex layer away from the substrate layer by a nitriding method, and the molar ratio of Cr element to N element in the CrN layer is (0.3-0.8):

1.

4. The non-stick sheet material assembly according to claim 1, characterized in that: The CrN layer is disposed on a surface of the concavo-convex layer away from the substrate layer, and the thickness of the CrN layer is 0.5 μm to 3 μm.

5. The non-stick sheet material assembly according to claim 1, characterized in that: The CrN layer is formed on a side of the concavo-convex layer away from the substrate layer by a nitriding method, and the thickness of the CrN layer is 0.5 μm to 80 μm.

6. The non-stick sheet material assembly according to claim 1, characterized in that: The concave-convex layer includes stainless steel, which includes: C≤0.08wt%, Si≤1wt%, Mn≤2wt%, P≤0.05wt%, S≤0.03wt%, 15wt% to 21wt% of Cr, 7wt% to 15wt% of Ni and Mo≤3wt%, and the remainder is Fe and unavoidable impurities.

7. The non-stick sheet material assembly according to claim 1, characterized in that: Also includes: A transparent non-stick layer is provided on at least a portion of the surface of the CrN layer away from the substrate layer, and the transparent non-stick layer contains at least one of Si and F.

8. The non-stick sheet material assembly according to claim 7, characterized in that: Calculated in atomic percentage, the transparent non-stick layer comprises: 1% to 10% Si, 20% to 40% C, 20% to 50% O, and the balance is H; Alternatively, the transparent non-stick layer comprises, in atomic percentage, 20% to 40% of F, 25% to 35% of C, 25% to 35% of O, and the balance being H.

9. The non-stick sheet material assembly according to claim 7, characterized in that: The thickness of the transparent non-stick layer is 1 nm to 100 nm.

10. The non-stick sheet material assembly according to any one of claims 1 to 9, characterized in that: In a cross section perpendicular to the non-stick sheet assembly, the projection width of the top of the protrusion on the plane where the substrate layer is located is d, and the projection width of the top of the groove on the plane where the substrate layer is located is k, satisfying d / (d+k) is 20% to 60%.

11. The non-stick sheet material assembly according to claim 10, characterized in that: The projection width d of the top of the protrusion on the plane where the substrate layer is located is 0.1 mm to 1.5 mm.

12. The non-stick sheet material assembly according to claim 10, wherein: The depth h of the groove is 40 μm to 150 μm.

13. The non-stick sheet material assembly according to claim 10, characterized in that In a cross section perpendicular to the non-stick plate assembly, the top of the protrusion is parallel to the plane where the substrate layer is located.

14. The non-stick sheet assembly of claim 13, characterized in that In a cross section perpendicular to the non-stick plate component, the groove is in an arc shape or an inverted trapezoidal shape.

15. The non-stick sheet material assembly according to claim 14, characterized in that The central angle α of the arc-shaped groove is not greater than 180°.

16. The non-stick sheet material assembly according to claim 14, wherein: The bottom angle β of the inverted trapezoidal groove is not less than 130°.

17. A method for preparing a non-stick sheet material assembly, characterized in that: include: Pre-treating the substrate to remove pollutants on the surface of the substrate; forming an etching mask surface with a preset pattern on one side of the pretreated substrate, and placing the side of the substrate with the etching mask surface in an etching solution for chemical etching to form a concave-convex layer including at least one protrusion and at least one groove alternately arranged; A CrN layer is formed on the surface of the concave-convex layer away from the substrate layer by using a PVD method, or a CrN layer is formed on the side of the concave-convex layer away from the substrate layer by using a nitriding method.

18. A cooking utensil, characterized in that: The invention comprises the non-stick sheet material component according to any one of claims 1 to 16 or the non-stick sheet material component prepared by the method according to claim 17.

19. The cooking appliance according to claim 18, wherein The container comprises a bottom wall and a side wall of the container, wherein the bottom wall of the container and the side wall of the container are connected to form a receiving space; The bottom wall of the container comprises the non-stick sheet component according to any one of claims 1 to 16 or the non-stick sheet component produced by the method according to claim 17; and / or the side wall of the container comprises the non-stick sheet component according to any one of claims 1 to 16 or the non-stick sheet component produced by the method according to claim 17.

20. A cooking device, characterized in that: A cooking utensil comprising the cooking utensil according to claim 18 or 19.

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